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Topic: Gearbox overhaul (Read 714 times)

Just picked up my swingarm a10 gearbox and I'm in the process of making a list of parts to order for an overhaul. What parts should I be looking to replace? I'm assuming gaskets, seals, and bushings but are there any other wearable parts that I should be aware of?

`Hi,If the gearbox came from an A10 then usually theres wear on the layshaft where it runs in the case bushesThe shaft can be machined or ground undersize and bushes made to suit.Look for wear on the gear engagement dogs,Quite often the final reduction gears at the inner end of the box will have wear on the gear teethLook for wear or pitting on all gear teethCheck for wear on the selector forks and camplate,Usually the kickstart quadrant and ratchet gear will be wornIts good practice to replce the gearchange return spring/ kickstart spring, but not essentialThe clutch arm pivot can often need bushing as the case wears

The sleeve gear bushes are often worn....you can check for this by seeing if the final drive sprocket has up and down play...

Am I missing something, or did you mean the clutch end of the mainshaft...?

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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easyAustralia

I'm just refreshing an SC box and the sleeve gear bushes were really bad. And has the usual layshaft wear issues. The Kickstart gear on the end of the mainshaft are also often clearly visually worn but readily available. Bit hard to miss the wear on that.If the dogs are pitted you will typically find gear noise when riding. These boxes are pretty robust and foolproof . Replace the sleeve gear seal and the natural time to review the final drive sprocket

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A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.New Zealand